Fix nits in pod files.

Add doc-nit-check to help find future issues.
Make podchecker be almost clean.
Remove trailing whitespace.
Tab expansion

Reviewed-by: Richard Levitte <levitte@openssl.org>

doc/crypto/EVP_BytesToKey.pod

diff --git a/doc/crypto/EVP_BytesToKey.pod b/doc/crypto/EVP_BytesToKey.pod
index 3d97854..ee5f678 100644
--- a/doc/crypto/EVP_BytesToKey.pod
+++ b/doc/crypto/EVP_BytesToKey.pod
@@ -44,7 +44,7 @@
 The key and IV is derived by concatenating D_1, D_2, etc until
 enough data is available for the key and IV. D_i is defined as:
 
-	D_i = HASH^count(D_(i-1) || data || salt)
+        D_i = HASH^count(D_(i-1) || data || salt)
 
 where || denotes concatenation, D_0 is empty, HASH is the digest
 algorithm in use, HASH^1(data) is simply HASH(data), HASH^2(data)